JP2009107236A - Friction tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a friction tool in which a friction body can be used having a contour suitable for a desired heat color changing area. <P>SOLUTION: The friction tool 1 rubs a thermal color changing image or handwriting that is formed on a surface to be written using a thermal color changing ink, so that the thermal color changing image or handwriting can be thermally changed in colors by a frictional heat generated by the rubbing. The frictional tool 1 includes a first friction body 2 and a second friction body 3 which is retractable inside/outside the first friction body 2. In using the first friction body 2, the second friction body 3 is absorbed in the first friction body 2. In using the second friction body 3, the second friction body 3 is projected outside from the first friction body 2. The surface of the first friction body 2 is formed in a convex, the surface of the second friction body 3 is formed in a convex. The radius of curvature R1 on the surface of the first friction body 2 is set larger than the radius of curvature R2 on the surface of the second friction body 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a friction tool. Specifically, the thermochromic image or handwriting formed on the writing surface (for example, on the paper surface) using the thermochromic ink is rubbed, and the thermochromic image or handwriting is generated by frictional heat generated at that time. The present invention relates to a heat discolorable friction tool.

Conventionally, Patent Document 1 describes a configuration in which a friction body for thermally discoloring an image or handwriting by thermochromic ink with frictional heat is provided at the top of the cap, or a configuration in which the friction body is provided at the rear end of the shaft cylinder. .

JP 2004-148744 A

The conventional friction tool has only one kind of friction tool when it is desired to thermally change a small area of a thermochromic image or handwriting or when a large area of a thermochromic image or handwriting is desired to be heat discolored. Therefore, there is a possibility that a friction body having an outer shape suitable for a desired heat discoloration area cannot be used. For example, when it is desired to thermally discolor a small area of a thermochromic image or handwriting, the conventional friction body may thermally discolor a portion of the thermochromic image or handwriting that is not to be discolored, On the other hand, when it is desired to thermally discolor a large area of a thermochromic image or handwriting, the conventional friction body requires a large number of frictions.

The present invention is intended to solve the above-described conventional problems, and to provide a friction tool that can use a friction body having an outer shape suitable for a desired thermal discoloration area.

A first invention of the present application rubs a thermochromic image or handwriting formed on a writing surface using a thermochromic ink, and heats the thermochromic image or handwriting with frictional heat generated at that time. A discolorable friction tool comprising a first friction body 2 and a second friction body 3 capable of moving in and out of the first friction body 2 and using the first friction body 2 In this case, the second friction body 3 is immersed in the first friction body 2, and when the second friction body 3 is used, the second friction body 3 is protruded outside from the first friction body 2. (Claim 1).

The friction tool 1 of the first invention is capable of thermally discoloring a thermochromic image or handwriting by friction, regardless of whether the first friction body 2 or the second friction body 3 is used. An externally shaped friction body suitable for the thermochromic area can be used.

According to a second invention of the present application, in the first invention, the contact area of the first friction body 2 when pressed against the writing surface with a constant load is the second when pressing against the writing surface with a constant load. It is a requirement that the contact area of the friction body 3 is set to be larger than that of the friction body 3 (claim 2).

The friction tool 1 according to the second aspect of the present invention compares the second friction body 3 that can obtain a relatively small contact area by making the second friction body 3 appear and disappear from the inside of the first friction body 2 that can obtain a relatively large contact area. A large contact area and a relatively small contact area can be easily obtained. In the friction tool 1 of the second invention, when it is desired to thermally discolor a relatively large area of a thermochromic image or handwriting, the first friction body 2 can be used, and the thermochromic image or The second friction body 3 can be used when it is desired to thermally change a relatively small area of the handwriting.

According to a third invention of the present application, in the second invention, the surface of the first friction body 2 is formed in a convex curve shape, and the surface of the second friction body 3 is formed in a convex curve shape. The requirement is that the radius of curvature R1 of the surface of the first friction body 2 is set larger than the radius of curvature R2 of the surface of the second friction body 3 (Claim 3).

The friction tool 1 of the third invention can obtain a relatively large contact area when pressed against the writing surface with a constant load by the first friction body 2 having a relatively large curvature radius R1. The second friction body 3 having a relatively small curvature radius R2 can provide a relatively small contact area when pressed against the writing surface with a constant load.

First friction body, second friction body In the present invention, the first friction body 2 and the second friction body 3 are preferably made of a soft material. Examples of the soft material constituting the first friction body 2 and the second friction body 3 include elastic resins (rubbers and elastomers), such as silicone resins and SBS resins (styrene-butadiene-styrene copolymer). Coalesce), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like.

The soft material constituting the first friction body 2 and the second friction body 3 is less wearable than the one made of a highly wearable elastic material (e.g., eraser), so that no debris is generated during friction. It is preferably made of an elastic material.

As an application example of the friction tool 1 of the present invention, a part of a writing tool (for example, an end of a writing tool main body or an end of a cap) that includes a thermochromic ink and has a pen tip capable of discharging the thermochromic ink. And the like, a configuration in which the friction tool 1 is a single unit of a size that can be directly gripped, a configuration in which the friction tool 1 is mounted on a holder that can be gripped, and the like.

-Thermochromic ink In the present invention, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining the occurrence temperature of the microcapsule is preferably used.

In the present invention, as shown in FIG. 3, the shape of the curve plotting the change in color density due to the temperature change is opposite to the case where the temperature is raised from the lower temperature side than the color change temperature range, and from the higher temperature side than the color change temperature range. The color changes by following a different path depending on the descending state, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. In FIG. 3, ΔH indicates a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the present invention, the discoloration temperature of the thermochromic ink by the frictional heat of the first friction body 2 and the second friction body 3 is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). . That is, in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration point [ It is effective to set the complete color development temperature (t ₁ )] in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Thereby, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and the image or handwriting by the reversible thermochromic ink is made by the first friction body 2 and the second friction body 3. It can be easily discolored by frictional heat.

In the friction tool of the present invention, a friction body having an outer shape suitable for a desired thermal discoloration area can be used.

1 and 2 show an embodiment of the friction tool 1 of the present invention.
The friction tool 1 according to the present embodiment includes a first friction body 2 and a second friction body 3 that can be projected and retracted from the inside of the first friction body 2. That is, the second friction body 3 can protrude from the inside of the first friction body 2 to the outside, and can be immersed in the inside from the outside of the first friction body 2.

The surface of the first friction body 2 is formed in a convex curved surface shape. The first friction body 2 includes an in / out hole 21 that opens to the outside from the convex curved surface. The second friction body 3 is slidably accommodated in the intrusion hole 21 of the first friction body 2. The intrusion hole 21 opens to the outside from the top of the convex curved surface of the first friction body 2.

The surface of the second friction body 3 is formed in a convex curved surface shape. The curvature radius R1 of the convex curved surface of the first friction body 2 is set larger than the curvature radius R2 of the convex curved surface of the second friction body 3.

The first friction body 2 is made of an elastic synthetic resin (for example, SBS resin, SEBS resin, silicone resin, etc.). The second friction body 3 is made of an elastic synthetic resin (for example, SBS resin, SEBS resin, silicone resin, etc.). The first friction body 2 and the second friction body 3 may be formed of the same material or different materials.

As means for causing the second friction body 3 to appear and disappear from the appearance hole 21 of the first friction body 2, the appearance and appearance that causes the second friction body 3 to appear and disappear by an external operation (for example, knocking operation, rotation operation, etc.). For example, the device and the second friction body 3 may be directly pressed in the protruding direction or the immersion direction.

Friction tool 1 of the present embodiment is a part of a writing tool (for example, an end portion of a writing tool main body or an end portion of a cap) that includes a thermochromic ink and has a pen tip that can discharge thermochromic ink. It may be attached to the holder, may be a single piece of a size that can be directly gripped, or may be attached to a holder that can be gripped.

When using the first friction body 2, the friction tool 1 of the present embodiment immerses the second friction body 3 in the first friction body 2 and uses the second friction body 3. The second friction body 3 is projected outward from the first friction body 2. As a result, even if either the first friction body 2 or the second friction body 3 is used, the image or the handwriting of the thermochromic ink can be thermally discolored by friction, and the outer surface suitable for the desired thermochromic area. A friction body having a shape can be selected and used.

In the friction tool 1 of the present embodiment, the contact area of the first friction body 2 when pressed against the writing surface with a constant load is such that the contact area of the second friction body 3 when pressed against the writing surface with a constant load. It is set larger than the contact area. According to the friction tool 1 of the present embodiment, when it is desired to thermally change a relatively large area of the image or handwriting of the thermochromic ink, the first friction body 2 can be used. The second friction body 3 can be used when it is desired to thermally change a relatively small area of an image or handwriting.

The friction tool 1 according to the present embodiment can obtain a relatively large contact area when pressed against the writing surface with a constant load by the first friction body 2 having a relatively large curvature radius R1. A relatively small contact area can be obtained when the writing surface is pressed with a constant load by the second friction body 3 having a relatively small curvature radius R2.

In the present invention, the surface of the first friction body 2 and the surface of the second friction body 3 may have a flat shape in addition to the convex curved shape, a cone, a pyramid, an oblique cut shape, or the like. May be pointed.
In the present invention, the cross-sectional shape of the first friction body 2 and the cross-sectional shape of the second friction body 3 may be any of a circle, an ellipse, a square, a polygon, and the like.

In embodiment of the friction tool of this invention, it is a partially cutaway longitudinal cross-sectional view which shows the state which made the 2nd friction body immersed in the 1st friction body. FIG. 2 is a partially cutaway longitudinal sectional view showing a state in which the second friction body protrudes from the first friction body to the outside in the friction tool of FIG. 1. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Friction tool 2 1st friction body 21 Intrusion hole 3 2nd friction body R1 The curvature radius R2 of the 1st friction body surface The curvature radius of the 2nd friction part surface

Claims (3)

A friction tool capable of rubbing a thermochromic image or handwriting formed on a writing surface using a thermochromic ink, and thermally discoloring the thermochromic image or handwriting by frictional heat generated at that time. ,
When the first friction body is used, the first friction body is composed of a first friction body and a second friction body that can be projected and retracted from the inside of the first friction body. When the second friction body is used while being immersed in the body, the second friction body protrudes outward from the first friction body. The contact area of the first friction body when pressed against the writing surface with a constant load is set larger than the contact area of the second friction body when pressed against the writing surface with a constant load. Friction tool. The surface of the first friction body is formed into a convex curved surface, the surface of the second friction body is formed into a convex curved surface, and the radius of curvature of the surface of the first friction body is set to The friction tool according to claim 2, wherein the friction tool is set to be larger than a radius of curvature of the surface.

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